To customize the conversion of any output files, you can type additional parameters following the "-o" entry. For example, you may want to customize output as detailed here:
-- Convert a .DXF file to an ASCII Version 00.55 (DWF 5) DWF file for display in CadViewer:
ax2008 -i <SOURCE_FILE.DXF> -o <NEW_FILE.DWF> -f=DWF -text -v=5